code: def _ExampleToInputs(self, ex, truncated_length=0):
      hparams = copy.deepcopy(configs.DEFAULT_HPARAMS)
  
      filename = ex.features.feature["id"].bytes_list.value[0]
      sequence = music_pb2.NoteSequence.FromString(
          ex.features.feature["sequence"].bytes_list.value[0]
      )
      wav_data = ex.features.feature["audio"].bytes_list.value[0]
  
      spec = data.wav_to_spec(wav_data, hparams=hparams)
      roll = sequences_lib.sequence_to_pianoroll(
          sequence,
          frames_per_second=data.hparams_frames_per_second(hparams),
          min_pitch=constants.MIN_MIDI_PITCH,
          max_pitch=constants.MAX_MIDI_PITCH,
          min_frame_occupancy_for_label=0.0,
          onset_mode="length_ms",
          onset_length_ms=32.0,
          onset_delay_ms=0.0,
      )
      length = data.wav_to_num_frames(
          wav_data,
          frames_per_second=data.hparams_frames_per_second(hparams),
      )
  
      return self._DataToInputs(
          spec,
          roll.active,
          roll.weights,
          length,
          filename,
          truncated_length,
      )
  
imports: import copy
  import tempfile
  import time
  from magenta.models.onsets_frames_transcription import configs
  from magenta.models.onsets_frames_transcription import constants
  from magenta.models.onsets_frames_transcription import data
  from note_seq import audio_io
  from note_seq import sequences_lib
  from note_seq import testing_lib
  from note_seq.protobuf import music_pb2
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the DataTest obj's underlying member method code with example usage: obj._ExampleToInputs(ex, truncated_length) and returns: self